Respuesta :
(3 + [tex] \sqrt{5} [/tex]) × (3 - [tex] \sqrt{5} [/tex])
Take the special case
(a - b)×(a + b)=a² - b²
a = 3
b = [tex] \sqrt{5} [/tex]
3² - ([tex] \sqrt{5} [/tex])² {(√)² = the number itself}
9 - 5
4
Take the special case
(a - b)×(a + b)=a² - b²
a = 3
b = [tex] \sqrt{5} [/tex]
3² - ([tex] \sqrt{5} [/tex])² {(√)² = the number itself}
9 - 5
4
(3 + √((5)) + (3 - √(5))
3(3 - √(5)) + √(5)(3 - √(5)))
3(3) - 3(√(5)) + √(5)(3) + √(5)(√(5))
9 - 3√(5) + 3√(5) - √(25)
9 - 5
4
3(3 - √(5)) + √(5)(3 - √(5)))
3(3) - 3(√(5)) + √(5)(3) + √(5)(√(5))
9 - 3√(5) + 3√(5) - √(25)
9 - 5
4